U-M's Greg Mattison: D-line technique a work in progress

http://archive.freep.com/VideoNetwork/2662885267001/U-M-s-Greg-Mattison-D-line-technique-a-work-in-progressrtmp://cp81310.edgefcs.net/ondemand/&mp4:brightcove/35547428001/201309/2707/35547428001_2662957583001_trim-JfGrAs.mp4http://archive.freep.com/VideoNetwork/2662885267001/U-M-s-Greg-Mattison-D-line-technique-a-work-in-progresshttp://bcdownload.gannett.edgesuite.net/detroitfreep/35547428001/201309/2371/35547428001_2662972265001_th-522f5e74e4b0b6ab6e84002a-1592194021001.jpgU-M's Greg Mattison: D-line technique a work in progressMichigan's defensive coordinator talks about where his defense is at entering Week 3 vs. Akron.2935greg mattisonmichigan wolverinessportsiphoneapp_mainDFP05:14